Which event takes place during atrial diastole?
Blood fills the left ventricle and empties the right.
Both the left and right atrial chambers fill with blood.
Blood fills the right atrium and empties the left.
Both the left and right atria are emptied of blood.
The Correct Answer is B
A. Blood fills the left ventricle and empties the right: This refers to the ventricles, not the atria, so it is incorrect in the context of atrial diastole.
B. Both the left and right atrial chambers fill with blood: During atrial diastole, the atria relax and fill with blood from the veins (superior/inferior vena cava for the right atrium and pulmonary veins for the left atrium).
C. Blood fills the right atrium and empties the left: This is incorrect because both atria fill with blood during atrial diastole.
D. Both the left and right atria are emptied of blood: This describes atrial systole (contraction), not diastole.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Inferior mesenteric artery: This artery is responsible for supplying blood to the distal part of the large intestine, including the descending colon, sigmoid colon, and rectum.
B. Inferior phrenic artery: This artery supplies blood to the diaphragm, not the large intestine or rectum.
C. Gonadal artery: The gonadal arteries supply blood to the reproductive organs, such as the ovaries or testes, not the large intestine.
D. Renal artery: The renal arteries supply blood to the kidneys and are unrelated to the blood supply of the large intestine or rectum.
Correct Answer is B
Explanation
A. Brain and aortic arch: The aortic arch contains peripheral chemoreceptors, but the central chemoreceptor is in the medulla.
B. Medulla of the brain stem: Central chemoreceptors located in the medulla monitor the levels of carbon dioxide (via pH changes) in the cerebrospinal fluid to regulate breathing.
C. Carotid arteries and brain stem: The carotid arteries contain peripheral chemoreceptors, but not central chemoreceptors.
D. Carotid arteries and aortic arch: These locations house peripheral chemoreceptors, not central ones.
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